2003 EB hvac dead

[Darkhorse393]

So the truck wouldn't start, turned out to be a loose positive cable. I cleaned and tightened the cable and started the truck. now my climate control is completely dead. display doesn't light up, rear does not work, nothing. Everything else in the truck seems to work radio, windows, lights. I tried to find a fuse or relay but I cant find any one that controls it. Any suggestions on where to start?

 

[Bedrck47]

check the following fuses with a METER NOT YOUR EYES

13, 116,14, 5, 33, 11

 

[Darkhorse393]

Checked all the fuses with a meter. I'm getting power on both sides. Is there a module or relay hidden somewhere that I can check?

 

[stamp11127]

I would pull the EATC and probe the connector for power and ground for continuity.

 

[stamp11127]

part 2

 

[Darkhorse393]

Thanks. I see I need to probe pins 11 and 22.i don't see a ground on the diagram. Do I just use the chassis as the ground or is there a pin in the plug? I appreciate the help. This is my family hauler and the kids can't have no AC on long trip or no heat come winter

 

[Darkhorse393]

Just a side note, since this happened my 4hi and 4low blink on and off when I start the truck, it's still goes into 4wd but I have never seen it do this before. Could it be related some how to the climate control problem?

 

[stamp11127]

pin 5 is ground. Could be related if you are in a state that salts the roads in winter.

 

[Darkhorse393]

In Ontario Canada, they use so much salt here that everybody's blood pressure goes up from just breathing the air

 

[Darkhorse393]

Unplugged the eatc and checked the pins for power and ground. Got 14.5v on pins 11 and 22 with the engine running. Could not get pin 5 to show as a ground. Plugged the eatc back in while engine was running and it turned on and seems to be working? Should just count myself lucky but I would like to know why it did what it did. Thanks for all the help guys